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Finding the Fourth Proportional to 108,920.80, 163,381.20 and 81,272.80

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Solution

The fourth proportional to 108,920.80, 163,381.20 and 81,272.80 is: 121,909.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,920.80 : 163,381.20 = 81,272.80 : x
  2. Step 2: Convert to fraction form
    108,920.80/163,381.20 = 81,272.80/x
  3. Step 3: Cross multiply
    108,920.80x = 163,381.20 × 81,272.80
  4. Step 4: Simplify right side
    108,920.80x = 13,278,447,591.36
  5. Step 5: Solve for x
    x = 13,278,447,591.36/108,920.80
  6. Step 6: Final answer
    x = 121,909.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.